is "Sound Bake" node here in 2.1.4 Animation node
You can't bake sound anymore, bc. you don't have to. Sound input is now live. It's a bit tricky, bc. it's not directly a node. 
Go to the VSE, drop a sound file wherever you want (meaning the start frame).
Back in the AN SHIFT A -> sound -> sound from sequence.
From there it gets processed in realtime, no more baking required.